W B Mason Co Inc is an active interstate carrier based in Brockton, MA.
No insurance filings on record.
View on FMCSA L&I| Vehicle Type | Owned | Term Leased | Trip Leased |
|---|---|---|---|
| Straight Trucks | 76 | 720 | 0 |
| Tractors | 0 | 38 | 0 |
| Trailers | 6 | 87 | 0 |
| Total Power Units | 834 | ||
Distinct vehicles · 24 mo
vs 834 self-reported (MCS-150)
Top makes
Registered in
Higher values = more violations. 0 = clean record.
| Category |
|---|
| Category | vs. Cohort | vs. State | Reading |
|---|---|---|---|
| Unsafe Driving | 60% | 86% | Around peer average |
| HOS Compliance | 60% | 96% | Around peer average |
| Driver Fitness | 80% | 88% | Worse than most peers |
| Controlled Substances | 0% | 0% | Better than most peers |
| Vehicle Maintenance | 60% | 88% | Around peer average |
Lower percentile = lower SMS measure = stronger safety record. Computed nightly across active carriers in the same state and fleet-size band.
| Type | Inspections | OOS | OOS % | Nat'l Avg |
|---|---|---|---|---|
| Driver | 0 | 10 | — | 6.67% |
| Vehicle | 0 | 27 | — | 22.26% |
| Hazmat | 0 | 0 | — |
| Period | Fatalities | Injuries | Tow-away | Total |
|---|---|---|---|---|
| Oct 1, 2025 | 0 | 0 | 1 | 1 |
| Jul 1, 2025 | 0 | 2 | 0 | 1 |
| Jan 1, 2025 | 1 | 5 | 7 | 7 |
| Oct 1, 2024 | 0 | 1 | 3 | 3 |
| Jul 1, 2024 | 0 | 0 | 1 | 1 |
Most-cited violation codes
| BASIC Category | Total | Severe | OOS |
|---|---|---|---|
| Vehicle Maintenance | 153 |
| Date | State | Vehicle | Violations | OOS |
|---|---|---|---|---|
| Mar 23, 2026 | FL | STRAIGHT TRUCK | 0 | 0 |
| Mar 19, 2026 | NJ | STRAIGHT TRUCK | 4 | 1 |
| Mar 18, 2026 | ME | STRAIGHT TRUCK | 1 | 0 |
| Mar 17, 2026 | NY | STRAIGHT TRUCK | 0 | 0 |
| Insp w/ Viol |
|---|
| Measure |
|---|
| Alert |
|---|
| Unsafe Driving | 38 | 0.40 | — |
| HOS Compliance | 3 | 0.03 | — |
| Vehicle Maintenance | 83 | 2.09 | — |
| Driver Fitness | 16 | 0.13 | — |
| Controlled Substances | 0 | 0.00 | — |
| 4.44% |
Where they run
Inspected in 20 states. Top state NY accounts for 36% of activity. Activity outside home state (MA): 93%.
+15 other states with fewer inspections
| 37 |
| 31 |
| Unsafe Driving | 40 | 24 | 0 |
| Driver Fitness | 16 | 4 | 11 |
| Hours-of-Service Compliance | 5 | 0 | 1 |
| Mar 16, 2026 |
| CT |
| STRAIGHT TRUCK |
| 2 |
| 0 |
| Mar 12, 2026 | PA | STRAIGHT TRUCK | 0 | 0 |
| Mar 11, 2026 | NJ | STRAIGHT TRUCK | 0 | 0 |
| Mar 10, 2026 | NY | STRAIGHT TRUCK | 1 | 0 |
| Mar 10, 2026 | NY | STRAIGHT TRUCK | 0 | 0 |
| Mar 9, 2026 | NY | STRAIGHT TRUCK | 0 | 0 |
| Date | Code | Description | BASIC | OOS |
|---|---|---|---|---|
| Mar 19, 2026 | 39347E | Brake Out of Adjustment - Roto Clamp (Short & Long) DD-3 or Bolt | Vehicle Maintenance | — |
| Mar 19, 2026 | 39353BB | Air Brake - CMV manufactured on or after 10/20/1994 has an automatic airbrake adjustment system that fails to compensate for wear | Vehicle Maintenance | — |
| Mar 19, 2026 | 39617CPI | Operating a CMV without documentation of a periodic inspection | Vehicle Maintenance | — |
| Mar 19, 2026 | 3963A1BOS | Brake - Defective brake(s) are equal to or greater than 20% of the service brakes on the vehicle/combination | Vehicle Maintenance | Yes |
| Mar 18, 2026 | 39311A1LCL | Lighting - Clearance lamp(s) missing | Vehicle Maintenance | — |
| Mar 16, 2026 | 3939ALBL | Lighting - Backup lamp inoperative | Vehicle Maintenance | — |
| Mar 16, 2026 | 3939ALHLI | Lighting - Headlamp(s) - Any inoperative | Vehicle Maintenance | — |
| Mar 10, 2026 | 3922SLLTCD | State/Local Laws - Failed to obey a traffic control device - Permanent or Temporary - e.g. safety official signal sign light lane marking other | Unsafe Driving | — |
| Mar 6, 2026 | 3922SLLS3 | State/Local Laws - Speeding 11-14 miles per hour over the speed limit | Unsafe Driving | — |
| Feb 25, 2026 | 39141APC | Medical (Certificate) - Operating a property-carrying vehicle without a valid medical certificate in possession or on file with the state drivers licensing agency | Driver Fitness | Yes |